You start this in the folder that contains the js file you are debugging (app.js in this case) and you have to install the node-inspector before you can start debugging by calling the npm command below.

npm install node-inspector

You also need chrome for this to work 🙂

Here is a screen shot of the four involved windows:the command prompt that starts the three processes,the iojs or node window running the app,the node-inspector (here running in iojs)and the chrome dev tools sitting on a break point and showing some info in the watch window